Defending against jamming attacks in wireless local area networks

Authors:
Wei Chen;Danwei Chen;Guozi Sun;Yingzhou Zhang
Affiliations:
Computer College, Nanjing University of Posts and Telecommunications, Nanjing, Jiangsu, China;Computer College, Nanjing University of Posts and Telecommunications, Nanjing, Jiangsu, China;Computer College, Nanjing University of Posts and Telecommunications, Nanjing, Jiangsu, China;Computer College, Nanjing University of Posts and Telecommunications, Nanjing, Jiangsu, China
Venue:
ATC'07 Proceedings of the 4th international conference on Autonomic and Trusted Computing
Year:
2007

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Abstract

Wireless local area networks(WLANs) work upon a shared medium and broadcast data frames via radio waves. These features let legitimate users connect to Internet conveniently at WLAN access points but also let a malicious attacker misuse network flexibly. Attackers can launch jamming attacks by exploiting vulnerabilities in 802.11, which is a dominant protocol used by WLAN. We discuss two jamming attacks, RTS and CTS jamming, and address their attacking conditions and threats. To defend against jamming attacks, a CUSUM based detection method is proposed, which can accurately detect jamming attacks with little computation and storage cost. When continuous attacking packets are sent out, a change-point will appear in a traffic sequence. Our detection method is capable to observe such change-points and then launch alarms. The efficiency of defense methods is verified by simulation results.